" The Most
Important Innovation of the 1990s in optica fiber sensing is the
development of Fiber Grating Sensors"

Fiber
Bragg Gratings reflect a narrow spectral part of light that is
guided in the fiber core at the Bragg wavelength, which is dependent
on the grating period and the refractive index of the fiber.
The grating period is sensitive to mechanical strain and
temperature. What distinguish the FBG sensor from conventional
electrical strain gauges is its excellent linear characteristics,
immune to Electromagnetic Interference (EMI), low fiber loss
(transmission over many kilometers), highly multiplexed distributed
sensor arrays and intrinsic safe in explosive
environments)

Features

stable and durable

can
be highly multiplexed (many sensing points in one single fiber
cable)